\documentclass{article}
\usepackage{pgfplots}
\usepgfplotslibrary{polar}
\usetikzlibrary{shapes.geometric}

\begin{document}
\begin{tikzpicture}
\begin{polaraxis}[
    x dir = reverse,
    xticklabel=$\pgfmathprintnumber{\tick}^\circ$,
    xtick={0,30,...,330},
]
\addplot table{
    0 1 
    30 2
    60 4
    90 6
    120 4
    };
\end{polaraxis}
\end{tikzpicture}
\end{document}
